import React,{useState} from 'react'
import { useSelector,useDispatch } from 'react-redux'
import classNames from 'classnames'
import { changeStatus, delTodo, selectAll } from '../../store/actions/todo'


export default function TodoMain() {
  // 准备currentId
  const [currentId, setCurrentId] = useState('')
  const list = useSelector((state) => state.todo)
  const dispatch =  useDispatch()
  // 删除
  const handleDel = (id) =>{
    dispatch(delTodo(id))
  }
  // 修改状态
  const handleChangeStatus = (id) =>{
    dispatch(changeStatus(id))
  }
  // !确定全选的状态，根据所有的单选的状态来确定
  const isCheckAll = list.every((item) => item.done)
  // !全选操作
  const handleChangeAll = () => dispatch(selectAll(!isCheckAll))
  return (
    <section className='main'>
      <input id='toggle-all' 
      className='toggle-all'
       type='checkbox' 
       checked={isCheckAll}
       onChange={handleChangeAll}
       />
      <label htmlFor='toggle-all'>Mark all as complete</label>
        {/* // #2. 用 currentID 和 item.id 进行比较，如果是 true 就应用 editing class */}
      <ul className='todo-list'>
        {list.map((item) => (
          <li
            key={item.id}
            className={classNames({
              completed: item.done,
              editing:item.id === currentId
            })}
          >
            <div className='view'>
              <input
                className='toggle'
                type='checkbox'
                checked={item.done}
                onChange={() =>  handleChangeStatus(item.id)}
              />
               {/* // #3. 双击 label 的时候，把当前的 item.id 给 currentID 就好啦 */}
              <label onDoubleClick={() =>setCurrentId(item.id)}>{item.name}</label>
              <button className='destroy' onClick={() => handleDel(item.id)}></button>
            </div>
            <input
              className='edit'
              value='Create a TodoMVC template'
              onChange={() => {}}
            />
          </li>
        ))}
      </ul>
    </section>
  )
}